class_docstr: {0,1,...,n-1}
  
  Example usage:
  self.observation_space = spaces.Discrete(2)
code: def sample(self):
      return prng.np_random.randint(self.n)
  
file_path: keras-rl/utils/gym/spaces/discrete.py
imports: import numpy
  import gym
  from ..None import prng
label_desc: Use image node_id 2 for calling the Discrete obj's underlying member method code with example usage: obj.sample() and returns: prng